Abstract
Abstract : Stationary stochastic processes have been very useful in analyzing time series appear in applications. However in many engineering application and economic studies there are number of important time series that are not stationary. Hence several authors have been studied non-stationary processes. Several classes of non-stationary processes such as: (1) Harmonizable processes; (2) Periodically Correlated (PC) processes; (3) Almost Periodically Correlated (PAC) processes; and (4) Correlation Autoregressive (CAR) processes have been introduced and studied. In this project we have studying the non-stationary processes in general and the PC, APC, and CAR processes in particular obtaining several results which either have been published or submitted for publication in refereed journals.
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